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  • A prototype integrated Ti:Sa laser is demonstrated by bonding the Ti:Sa gain medium on silicon nitride microring resonators. Lasing is demonstrated between 730 nm and 830 nm with a threshold power as low as 6.5 mW.

    • Yubo Wang
    • Jorge A. Holguín-Lerma
    • Hong X. Tang
  • A hyperspectral camera based on a random array of CMOS-compatible Fabry–Pérot filters is demonstrated. The hyperspectral camera exhibits performance comparable with that of a typical RGB camera, with 45% sensitivity to visible light, a spatial resolution of 3 px for 3 dB contrast, and a frame rate of 32.3 fps at VGA resolution.

    • Motoki Yako
    • Yoshikazu Yamaoka
    • Atsushi Ishikawa
    Letter Open Access
  • The combination of optical phase conjugation and light amplification enables wavefront shaping with simultaneously optimized operational speed, number of control degrees of freedom and energy of the focused wavefront. Shaping with a 10 μs latency time over about 106 control modes and energy gain approaching unity is demonstrated.

    • Zhongtao Cheng
    • Chengmingyue Li
    • Lihong V. Wang
  • Recollected by his colleagues as a creative and humble scholar with an indomitable will, Byoungho Lee was enthusiastic about realizing the holistic potential of holographic displays.

    • YongKeun Park
    • Jae-Hyeung Park
    • Ting-Chung Poon
  • Quantum recoil is experimentally observed via photon energy shifts in Smith–Purcell radiation. Leveraging van der Waals materials as atomic-scale gratings, the quantum recoil is measured at room temperature on a tabletop platform.

    • Sunchao Huang
    • Ruihuan Duan
    • Liang Jie Wong
  • A terawatt laser filament is shown to be able to guide lightning over a distance of 50 m in field trials on the Säntis mountain in the Swiss Alps.

    • Aurélien Houard
    • Pierre Walch
    • Jean-Pierre Wolf
    Article Open Access
  • Relative synchronization between free-electron laser pulses and a near-infrared field fields is achieved with 24 as resolution by using a correlation analysis of single-shot photoelectron spectra. It is applied to coherently control the photoionization process in neon atom on the attosecond timescale.

    • Praveen Kumar Maroju
    • Michele Di Fraia
    • Giuseppe Sansone
  • Two-dimensional massive and massless Dirac fermions in HgTe/CdHgTe quantum wells yield terahertz Landau emission. The emission frequency is continuously tunable with magnetic field or carrier concentration, over the range from 0.5 to 3 THz.

    • S. Gebert
    • C. Consejo
    • F. Teppe
  • A chip-scale laser platform based on silicon nitride ring resonators and commercial Fabry–Pérot laser diodes is developed for the wavelength range from 404 nm to 785 nm. The achieved coarse and fine tunings are up to 12.5 nm and 33.9 GHz, respectively, with kilohertz-scale linewidths and side-mode suppression ratios above 35 dB.

    • Mateus Corato-Zanarella
    • Andres Gil-Molina
    • Michal Lipson
  • Metalenz, a spin-out company from Harvard University founded in 2016, has launched its first metasurface-based product. Nature Photonics spoke with co-founder Federico Capasso about the company and its plans for flat optics.

    • Giampaolo Pitruzzello
  • The resonance wavelengths of optical Möbius strip microcavities can be continuously tuned via geometric phase manipulation by changing the thickness-to-width ratio of the strip.

    • Bruno Piccirillo
    • Verónica Vicuña-Hernández
    News & Views
  • George Palikaras, President and CEO of Meta Materials Inc., discusses the challenges of commercializing metamaterials, learned on the path from a small start-up to a Nasdaq-listed company.

    • David Pile
  • Early research towards bulk metamaterials and exotic properties has been supplanted by work on thin metasurfaces ripe for commercialization, as outlined in this Focus issue.

  • Geoffroy Lerosey, co-founder and CEO/CSO of Greenerwave, shares how tunable metasurfaces may shake up industries from automotive to wireless communications.

    • David Pile